/*
 * @name Coordinates
 * @description All shapes drawn to the screen have a position that is 
 * specified as a coordinate. All coordinates are measured as the distance from
 * the origin in units of pixels. The origin [0, 0] is the coordinate in the
 * upper left of the window and the coordinate in the lower right is [width-1, 
 * height-1].
 */
function setup() {
  // Sets the screen to be 640 pixels wide and 360 pixels high
  createCanvas(720, 400);
}

function draw() {
  // Set the background to black and turn off the fill color
  background(0);
  noFill();

  // The two parameters of the point() method each specify 
  // coordinates.
  // The first parameter is the x-coordinate and the second is the Y 
  stroke(255);
  point(width * 0.5, height * 0.5);
  point(width * 0.5, height * 0.25); 

  // Coordinates are used for drawing all shapes, not just points.
  // Parameters for different functions are used for different 
  // purposes. For example, the first two parameters to line()  
  // specify the coordinates of the first endpoint and the second  
  // two parameters specify the second endpoint
  stroke(0, 153, 255);
  line(0, height*0.33, width, height*0.33);

  // By default, the first two parameters to rect() are the 
  // coordinates of the upper-left corner and the second pair
  // is the width and height
  stroke(255, 153, 0);
  rect(width*0.25, height*0.1, width * 0.5, height * 0.8);
}